<div dir="ltr">Hi Mauro, I have built my pinhole collimator as follows: I first built a single slab of tungsten and then I have created the holes using two cones. Here's the code I used: #----------------------------------------------------- ## Collimator /gate/world/daughters/name collimator /gate/world/daughters/insert box /gate/collimator/geometry/setXLength 21 cm /gate/collimator/geometry/setYLength 16 cm /gate/collimator/geometry/setZLength 0.4 cm /gate/collimator/placement/setTranslation 0.0 0.0 -2.0 mm /gate/collimator/setMaterial Tungsten /gate/collimator/vis/setVisible 1 /gate/collimator/vis/setColor black /gate/collimator/vis/forceWireframe #Insert the first hole of air in the collimator /gate/collimator/daughters/name hole1 /gate/collimator/daughters/insert cone /gate/hole1/geometry/setRmin1 0 cm /gate/hole1/geometry/setRmax1 0.2 cm /gate/hole1/geometry/setRmin2 0 cm /gate/hole1/geometry/setRmax2 0.1 cm /gate/hole1/geometry/setHeight 0.2 cm /gate/hole1/placement/setTranslation 0.0 0.0 -0.1 cm /gate/hole1/setMaterial Air /gate/hole1/vis/setVisible 1 /gate/hole1/vis/setColor red /gate/hole1/vis/forceWireframe #Insert the second hole of air in the collimator /gate/collimator/daughters/name hole2 /gate/collimator/daughters/insert cone /gate/hole2/geometry/setRmin1 0 cm /gate/hole2/geometry/setRmax1 0.1 cm /gate/hole2/geometry/setRmin2 0 cm /gate/hole2/geometry/setRmax2 0.2 cm /gate/hole2/geometry/setHeight 0.2 cm /gate/hole2/placement/setTranslation 0.0 0.0 0.1 cm /gate/hole2/setMaterial Air /gate/hole2/vis/setVisible 1 /gate/hole2/vis/setColor red /gate/hole2/vis/forceWireframe I hope it can be helpful </div><div class="gmail_extra"> <div class="gmail_quote">2015-05-12 16:48 GMT+02:00 <a href="mailto:MauroNappa@libero.it">MauroNappa@libero.it</a> <<a href="mailto:MauroNappa@libero.it" target="_blank">MauroNappa@libero.it</a>>: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div></div>Dear all My name is Mauro and I have been working on gate since two weeks so far. gate is not very easy for me and I need to construct a pinhole collimator geometry, but I can't understand how to write the volume about the pinhole. Can anyone help me or give any general suggestion to me. Thank You very much Kind Regards Mauro _______________________________________________ Gate-users mailing list <a href="mailto:Gate-users@lists.opengatecollaboration.org">Gate-users@lists.opengatecollaboration.org</a> <a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" target="_blank">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a> </blockquote></div> </div>